Carl gantzhoen



(No Model.)

0. GANTZHORN.

Stop Watch.

Patented Nov. 23,1880.

WITNESSES N VENTOR %ak// w g ATTORNEY N. PETERS, PHOTO-UTHOG UNITED STATES PATENT QEEibE.

CARL GANTZHORN, OF NEWV YORK, N. Y.

STOP-WATCH.

SPECIFICATION forming part of Letters Patent No. 234,768, dated November 23, 1880.

q Application filed April 12, 1880.

To all whom it may concern:

Be it known that I, CARL GANTZHORN, of the city, county, and State of New York, have invented certain new and useful Improvements in Stop-WVatches, of which the following is a specification.

In the accompanying drawings, Figurel represents a top view, and Fig. 2 a vertical transverse section on line 00 a, Fig. 1, of my improved stop-watch.

Similar letters of reference indicate corresponding parts.

The invention has reference to an improved construction of stop-watch for use in timing races and for other purposes; and it consists of a trausmittin g gear-wheel, which is arranged to slide vertically to the arbor of the second-hand by the action of aforked spring-arm and beveled lever. Fixed spring-arms of the arbor of the sec ond-hand bear on pins of the slidinggear-wheel on the same side of the pins, so as to engage the gear-wheel in raised as well as in lowered position. When raised bythelever and forked spring-arm the gear-wheel intermeshes with an intermediate gear-wheel, to which the shifting mechanism is applied, and which gears with a third gear-wheel, carrying the arbor of the quarter-second hand.

Referring to the drawings, A represents the arbor of the second-hand, from which my improved timing attachment receives its motion.

To the upper end of the arbor A are keyed two spring-arms, a a, which extend radially from the arbor A. Below the spring-arms is arranged a gear-wheel, B, which slides loosely on the arbor A when raised or lowered by the free forked end of a spring-arm, O, the opposite end of which is permanently attached to the top plate of the movement.

Upon a cross-pin of the slotted middle portion of the spring-arm G acts the beveled or wedge-shaped end of a fulcrumed lever, D, which, when pushed to one side or to the other, raises or lowers the spring-arm, and thereby raises or lowers the gear-wheel B.

The spring-arms a a of the second-hand arbor bear on pins 7) b of the gear-wheel A, both upon the same side of the pins. One springarm serves to carry the gear-wheel along, while the other arm serves as a cushioning-spring when stopping the timing attachment for the (No model.)

purpose of neutralizing the shock imparted by the sudden stoppage, as well as for preventing any retarding influence on the second-hand gear.

WVhen the gear-wheel B is raised it is thrown into gear with a second or intermediate gearwheel, B, which again gears withathirdwheel, B turning loosely on the arbor of the minute and hour hands, and carrying on a sleeve the quarter-second hand. The moment therefore the lever D is pushed to one side the intermeshing set of gear-wheels are thrown into motion and the timing quarter-second hand is started. On pushing the lever back the gearwheel on the arbor of the second-hand is thrown out of gear and the timing-hand stopped. It is then returned to the starting-point by the well-known shifting mechanism, consisting of a fulcrumed lever, E, and heart-cam E, the latter being applied to the arbor of the second or intermediate gearwheel, B. A curved spring-arm, C, with forked end, extends from the spring-arm O to the arbor of the intermediate gear-wheel, B, and bears upon the same when the timing attachment is not in motion, but is raised with the spring-arm G by the lever, so as to exert no friction on the intermediate wheel, as soon as the gear-wheel of the second-hand arbor is thrown into gear with the intermediate gear-wheel for starting the timing attachment.

I am aware that the heart-cam and shiftinglever, as well as the starting and stopping lever and spring-arm, are well-known devices in stop-watches, and I do not claim the same.

The essential feature of my stop-watch is the driving of the timing mechanism from the arbor of the second-hand and the connection of the sliding gear-wheel having projecting pins by spring-arms of the arbor bearing on the same side of the pins, so that the gearwheel is always carried along by the arbor of the second-hand, but at the same time a remedy provided for the shocks caused by the starting and stopping of the timing attachment.

Having thus described my invention, I claim as new and desire to secure by Letters l atent- 1. In a timing attachment for watches, the combination, with the arbor of the secondhand, having fixed radial spring-arms, of a transmitting gear-wheel sliding on said arbor and being provided with upwardly-projecting pins upon which the spring-arms bear at the same side, as set forth.

2. In a timing attachment for watches, the combination of a fulcrnmed lever and forked spring-arm with a transmitting gear-wheel sliding on the arbor of the second-hand, said gear-wheel being connected by pins with radial spring-arms of the arbor bearing on the same side of the pins, substantially as described.

3. In a timing attachment for watches, the combination of a vertically-sliding transmitting gear-w heel connected by pins with springarms of the arbor of the secondhand, said spring-arms bearing on the same side of the pins, with an intermediate gear-wheel and shifting mechanism, and with a third wheel, carrying the timing quarter-second hand, all as shown and described.

4. In a timing attachment for watches, the combination of a vertically-sliding transmitting gear-wh eel connected by pins with springarms of the'arbor of the second-hand, and of an intermediate gear'wheel, to which the shifting mechanism is applied, with a spring-arm having two forked ends,one of which engages the lower part of the transmitting and the other the top part of the intermediate gearwheel, substantially as specified.

In testimony that I claim the foregoing as my invention I have signed 1113 name, in presence of two witnesses, this 5th day of April, 1880.

CARL GANTZHORN.

Witnesses PAUL GoEPEL, ADOLF DENGLER. 

